The patch titled
mm: disable preemption in apply_to_pte_range
has been added to the -mm tree. Its filename is
mm-disable-preemption-in-apply_to_pte_range.patch
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------------------------------------------------------
Subject: mm: disable preemption in apply_to_pte_range
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Lazy mmu mode needs preemption disabled, so if we're apply to init_mm
(which doesn't require any pte locks), then explicitly disable preemption.
(Do it unconditionally after checking we've successfully done the
allocation to simplify the error handling.)
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/memory.c~mm-disable-preemption-in-apply_to_pte_range mm/memory.c
--- a/mm/memory.c~mm-disable-preemption-in-apply_to_pte_range
+++ a/mm/memory.c
@@ -1718,6 +1718,7 @@ static int apply_to_pte_range(struct mm_
BUG_ON(pmd_huge(*pmd));
+ preempt_disable();
arch_enter_lazy_mmu_mode();
token = pmd_pgtable(*pmd);
@@ -1729,6 +1730,7 @@ static int apply_to_pte_range(struct mm_
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
+ preempt_enable();
if (mm != &init_mm)
pte_unmap_unlock(pte-1, ptl);
_
Patches currently in -mm which might be from jeremy@xxxxxxxx are
origin.patch
linux-next.patch
mm-disable-preemption-in-apply_to_pte_range.patch
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